Eelco Doornbos @eelcodoornbos.bsky.social · 03/07/2025IMAP, to be launched with SWFO-L1 will also provide measurements. But not keeping the other missions around is wasting the opportunity of being able to learn more about the solar wind from multi-point observations. I’m even more sad if the truly unique magnetosphere and ionosphere missions stop. 010
Eelco Doornbos @eelcodoornbos.bsky.social · 12/06/2025…starting writing the geomagnetic storm myth paper… 120
Eelco Doornbos @eelcodoornbos.bsky.social · 12/06/2025Sure. There are good papers with equations relating orbital mean motion (from TLEs, related to height) with thermosphere density. And there are models that relate density to solar EUV proxies like F10.7. It’s nice to be able to connect these together, but this is not that often done anymore. 120
Eelco Doornbos @eelcodoornbos.bsky.social · 12/06/2025Strangely enough this has already been obvious from data and incorporated in models used by space operators since the 1960s (eg Jacchia reports and models). Yet since about 5 years ago, storms have become the only apparent culprit, in popular articles, science papers as well as funding calls. 220
Eelco Doornbos @eelcodoornbos.bsky.social · 12/06/2025Another article completely overselling the importance of geomagnetic storms for orbital lifetime and downplaying the lesser known but much more important solar EUV variability. 1110
Eelco Doornbos @eelcodoornbos.bsky.social · 11/06/2025Congrats! Looking forward to more beautiful images and especially to what we can learn from this one-of-a-kind data in the coming years! 020
Reposted by Eelco DoornbosCosmicRami 🏳️🌈🏳️⚧️ @rami.spaceaustralia.com · 10/05/2025Let’s make today (May 10) Magnetosphere Appreciation Day! A year ago today we had that huge aurora display, caused by the most powerful geomagnetic storm experienced in decades. Lovely visualisations by NASA SVS/NASA DRIVE science centre on how our atmosphere and magnetosphere responded. 🧪🔭☀️🧲 19470124
Eelco Doornbos @eelcodoornbos.bsky.social · 10/05/2025Funny (but also not funny). It probably took the Bering Sea mention from the ERBS reentry news articles and thought it would likely look good to include it here. 010
Eelco Doornbos @eelcodoornbos.bsky.social · 10/05/2025The statement mentions "calculations" not "observations", so there's probably some associated residual uncertainty. The final trajectory could have been tracked from Russia half an hour earlier, or perhaps from India just minutes earlier, but I don't know if such observations exist or were used. 110
Eelco Doornbos @eelcodoornbos.bsky.social · 10/05/2025NY Times links to a ROSCOSMOS Telegram message, citing a 6:24 reentry west of Middle Andaman Island, based on their calculations. Observations are not mentioned, so I think we still need to interpret this with some residual uncertainty. www.nytimes.com/2025/05/10/s... 000
Eelco Doornbos @eelcodoornbos.bsky.social · 10/05/2025That TIP is suspect to me. It has the exact same time/location as the previous one, just with a smaller window (12 vs 59 min). If the reentry was indeed over the Indian Ocean off the coast of Indonesia as news sites report, this could have been about 6:30 UTC, matching the end of the longer window. 000
Eelco Doornbos @eelcodoornbos.bsky.social · 10/05/2025A bit strange then, that the latest space-track.org TIP (message of 10 UTC) is now for reentry at 0532 UTC with a 12 minute uncertainty window. This looks like an error in entering the data, as the time is exactly the same as for the previous TIP, while the window is smaller. 011
Eelco Doornbos @eelcodoornbos.bsky.social · 10/05/2025Very pretty! I'll be taking the train to get there on Monday. Always looking forward to seeing the city again. 110
Eelco Doornbos @eelcodoornbos.bsky.social · 10/05/2025Certainly not! The orbit I'm plotting (based on TLEs from space-track.org) does not account for the very rapid increase in drag during the final orbits. So it extends further in time than the actual trajectory, for which we don't yet have the final information. 030
Eelco Doornbos @eelcodoornbos.bsky.social · 10/05/2025I've made the TLE orbit available in the space weather timeline viewer, useful for checking against the reported prediction windows and observations. The TLE orbit height is not accurate and the orbit therefore extends beyond the expected reentry time: spaceweather.knmi.nl/viewer/?layo...spaceweather.knmi.nl 150
Reposted by Eelco DoornbosDr. Craig DeForest ☀️ @craig.deforest.org · 17/04/2025NASA just released the first-light images from the PUNCH mission! The WFI images are spectacular. More images will be forthcoming on the PUNCH website soon. 🔭🛰️☀️blogs.nasa.govNASA’s PUNCH Mission Captures First Images of Sun, Space – PUNCH 4395
Eelco Doornbos @eelcodoornbos.bsky.social · 29/03/2025Spectacular looking eruption. However, it was more E than NE. This source of the SUVI images does not put north up, for some reason. That plays a role for assessing the probability of a geomagnetic storm in case this region continues to erupt. 030
Reposted by Eelco DoornbosKNMI @knmi.nl · 27/03/2025Uitbarstingen op de zon kunnen onze infrastructuur raken. Dankzij herontdekte magnetismemetingen uit 1859 kan het KNMI nu beter inschatten wat de impact zou zijn van extreem ruimteweer. 🔗 www.knmi.nl/over-het-knm... 0253
Reposted by Eelco DoornbosMathew Owens @mathewjowens.bsky.social · 25/03/2025There are 3 space-weather posts opening up at the UK Met Office Space Weather Operations Centre. Please circulate - it would be great to further strengthen the MOSWOC team. careers.metoffice.gov.uk/join-us/sear... careers.metoffice.gov.uk/join-us/sear... careers.metoffice.gov.uk/join-us/sear...careers.metoffice.gov.ukMet Office Careers 11413
Eelco Doornbos @eelcodoornbos.bsky.social · 19/03/2025Did something similar before the workshop. Boulder is such a nice place. 030
Reposted by Eelco DoornbosAustrian Space Weather Office @aswogeosphere.bsky.social · 12/03/2025There is a new citizen science project for tracking solar radio bursts in Solar Orbiter data 👇 www.zooniverse.org/projects/xbo...zooniverse.orgZooniverseThe Zooniverse is the world’s largest and most popular platform for people-powered research. 0107
Reposted by Eelco DoornbosDr. Craig DeForest ☀️ @craig.deforest.org · 12/03/2025PUNCH is orbiting and all four spacecraft are Sun-pointed. I can sleep now. ☀️🛰️🔭🚀 5858
Reposted by Eelco DoornbosVincent Ledvina @vincentledvina.bsky.social · 27/01/2025While we are in a bit of a CME drought right now, worry not, the Sun is still active. Look at this incredible filament eruption yesterday near the Sun's eastern limb. This CME is not directed at Earth, but it looked spectacular in EUV imagery. #heliophysics 619524
Eelco Doornbos @eelcodoornbos.bsky.social · 24/01/2025This was done before for the May ARCTICS survey data, visualised here, for example: spaceweather.knmi.nl/viewer/?layo... 000
Eelco Doornbos @eelcodoornbos.bsky.social · 24/01/2025Do you perhaps want to discuss hosting the data on the KNMI HAPI server? 200
Reposted by Eelco DoornbosVincent Ledvina @vincentledvina.bsky.social · 17/01/2025theauroraguy.com/blogs/blog/t...theauroraguy.comThe Severe Geomagnetic Storm of October 2024The G4 SEVERE geomagnetic storm of October 2024 created stunning auroral displays. Find out why it was unique and how you can predict the aurora next time! 1142
Eelco Doornbos @eelcodoornbos.bsky.social · 17/01/2025For much of mid-lat Europe, the May storm was so much more impressive than the October storm, due to the fair weather and the one well-timed substorm on May 10 at around 22:30, when darkness had set in but people were still up and outside. 000
Eelco Doornbos @eelcodoornbos.bsky.social · 17/01/2025Great info and analysis, Vincent! The Oct storm also had an advantage of longer darkness in the northern hemisphere. The May storm was closer to summer solstice, so much more of the activity was simply invisible, because it happened during daylight in large parts of the inhabited world. 100
Reposted by Eelco DoornbosKarl Battams @sungrazercomets.bsky.social · 12/01/2025Comet G3 ATLAS looking great in the raw Blue filter LASCO C3 images! ☀️🔭 14610
Eelco Doornbos @eelcodoornbos.bsky.social · 08/01/2025I've created some summary plots of space weather in 2024 for a publication of our institute looking back on last year. These are the English language versions. In the flare plot, the largest flare for each month is labeled. 093
Eelco Doornbos @eelcodoornbos.bsky.social · 20/12/2024The survey locations from this paper are also available in these timeline viewer layouts. spaceweather.knmi.nl/viewer/?layo... and spaceweather.knmi.nl/viewer/?layo... Thanks to the authors for making this dataset available. I look forward to further work making combinations of datasets more useful.spaceweather.knmi.nlSpace Weather Timeline Viewer 040
Eelco Doornbos @eelcodoornbos.bsky.social · 19/12/2024The two slow eruptions of last Tuesday can be nicely tracked from GOES SUVI 304Å to SOHO LASCO C2. They are followed by the very fast far-side halo CME, which was not visible in SUVI 304Å, only in LASCO. Using jHelioviewer. 010
Eelco Doornbos @eelcodoornbos.bsky.social · 27/11/2024Very interesting Veritasium movie about Amelia Earhart's last flight, with some great info about 1930s radio navigation methods, mentioning the frequency-dependent role of the ionosphere. Highly recommended! bsky.app/profile/veri...youtube.comThe Physics That Doomed Amelia EarhartYouTube video by Veritasium 041
Reposted by Eelco DoornbosMathew Owens @mathewjowens.bsky.social · 22/11/2024Our paper on the importance of time-dependent solar-wind modelling is out. A few key points in the posts below. (1/7) www.nature.com/articles/s41...nature.comThe importance of boundary evolution for solar-wind modelling - Scientific ReportsScientific Reports - The importance of boundary evolution for solar-wind modelling 14411
Eelco Doornbos @eelcodoornbos.bsky.social · 18/11/2024I'm starting to dive into the ionosphere data from Android phones published last week in Nature: doi.org/10.1038/s415.... Browsing through the contents behind the paper's data link (doi.org/10.24433/CO.... - play the video). This is a rich dataset for ionospheric research!files.codeocean.com 000